tweaks

AnimationDirector.js

@@ -594,6 +594,7 @@
   }
 
   function scaleCubeUvs(cube, x, y) {
+    if (typeof Format === 'undefined' || Format?.id !== 'geckolib_model') return;
     if (x === 1 && y === 1) return;
     if (cube.box_uv) {
       if (typeof cube.setUVMode !== 'function') throw new Error('Box UV conversion is unavailable in this Blockbench version.');
@@ -611,6 +612,7 @@
   }
 
   function expandProjectUvs(width, height) {
+    if (typeof Format === 'undefined' || Format?.id !== 'geckolib_model') return false;
     const oldWidth = validUvDimension(Project.texture_width), oldHeight = validUvDimension(Project.texture_height);
     const nextWidth = Math.max(oldWidth, width), nextHeight = Math.max(oldHeight, height);
     if (nextWidth === oldWidth && nextHeight === oldHeight) return false;
@@ -623,6 +625,7 @@
   }
 
   function normalizeCubeUvs(cube, actorIndex, width, height, original = null) {
+    if (typeof Format === 'undefined' || Format?.id !== 'geckolib_model') return false;
     width = validUvDimension(width); height = validUvDimension(height);
     const all = getActorUvBasis(), actor = all[actorIndex];
     const key = cube.uuid || cube.name;
@@ -641,6 +644,7 @@
   }
 
   function normalizeActorUvs(actorIndex, width, height, original = null) {
+    if (typeof Format === 'undefined' || Format?.id !== 'geckolib_model') return false;
     let changed = false;
     for (const cube of Cube.all) {
       if (cubeBelongsToActor(cube, actorIndex)) changed = normalizeCubeUvs(cube, actorIndex, width, height, original) || changed;

test/uv-normalization.test.js

@@ -42,7 +42,7 @@ function harness() {
     fromDataURL(url) { this.source = url; return this; }
     add() { Texture.all.push(this); return this; }
   }
-  const context = { Buffer, requireNativeModule: require, Group, Cube, Texture, console,
+  const context = { Buffer, requireNativeModule: require, Group, Cube, Texture, console, Format: { id: 'geckolib_model' },
     setTimeout(callback) { callback(); },
     Undo: { initEdit() {}, finishEdit() {}, cancelEdit() {} },
     Project: { texture_width: 64, texture_height: 64, box_uv: true },
@@ -69,6 +69,26 @@ test('growing the project UV canvas preserves other actors and converts box UVs'
   assert.deepEqual(Array.from(actor1.faces.north.uv), [0, 0, 64, 16], 'Repeated refreshes must not rescale UVs');
 });
 
+test('non-GeckoLib projects keep UVs, canvas dimensions and box UV mode while still assigning textures', () => {
+  for (const format of ['optifine_entity', 'optifine_part', 'bedrock', 'free', 'java_block']) {
+    const h = harness(), cube = new h.Cube('actor1_body', true);
+    h.context.Format.id = format;
+    const before = JSON.stringify(cube.faces.north.uv);
+    const texture = new h.Texture({ name: 'custom.png', uv_width: 128, uv_height: 128 });
+    texture.add();
+    assert.equal(h.expandProjectUvs(128, 128), false);
+    assert.equal(h.normalizeActorUvs(1, 128, 128), false);
+    h.scaleCubeUvs(cube, 2, 2);
+    h.applyActorTexturePreview(1, 'custom.png');
+    assert.equal(JSON.stringify(cube.faces.north.uv), before);
+    assert.equal(cube.faces.north.texture, texture.uuid);
+    assert.equal(cube.box_uv, true);
+    assert.equal(h.context.Project.texture_width, 64);
+    assert.equal(h.context.Project.texture_height, 64);
+    assert.equal(h.context.Project.animationdirector_actor_uv_basis, undefined);
+  }
+});
+
 test('assigning a manually imported texture to an actor normalizes only that actor once', () => {
   const h = harness(), selected = new h.Cube('actor1_body'), other = new h.Cube('actor2_body');
   h.normalizeActorUvs(1, 64, 64); h.normalizeActorUvs(2, 64, 64);